Python

Python Interview Questions and Answers
Python Interview Questions and Answers When interviewing a potential employee, it is important to find out as much as you can about their past work experiences, as well as their professional goals for the future.
In this Blog, we’ve compiled some of the most popular questions and answers from previous interviews with some of the top Python developers in the world.

What is Python?
Python is a programming language that was created by Guido Van Rossum. It’s free and open source, and can be used to create just about anything. It supports multiple programming paradigms, including object-oriented programming and procedural languages.
Python can handle tasks like: web development, scripting, data analysis and visualization, and much more. Python is an interpreted, object-oriented, high-level programming language.
It is often compared to Tcl, Perl, Scheme or Java. Its design philosophy emphasizes code readability and has a significant following in data science. Python attempts to be more like “C” than “C++”.

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What are the Ways to Download Python?
Python can be downloaded from the Python website. To download it, enter the “python” command in your terminal and hit enter. Once you have downloaded it, you can run python code on your computer by typing python code into the terminal and hitting enter.
There are many different ways to download Python. The most popular methods are through the Linux Apt-Get Package Manager, Python’s own package installer, and a variety of third party package managers such as PyPi, Pip, and Conda.

 
How to Run Python Program in Command Line?
Python is a high-level, interpreted programming language with dynamic semantics. It provides features like object-oriented programming, strong typing, and exception handling. Python is often used as a scripting language due to its quick turnaround time and ability to be used in both large and small systems.
The interpreter is available for many operating systems, including Windows 10, Mac OS X, Linux and Unix Systems.
To run a Python program from the command line, execute it by typing python filename at a terminal window. The following example shows running the hello_world.py program from the command line:
The way to run a Python program in the command line is by typing python myprogram.py into the terminal window and pressing enter. You can also add it to your path or run it from the Terminal-app application, but we’ll talk more about that later on.

What is Scope in Python? Its Types.
The scope defines the set of rules which tell us how and where a variable can be searched.
To access the particular variable in the code, the scope must be defined as it cannot be accessed from anywhere in the program. The particular coding region variables are visible is known as scope.
The variable is searched either to retrieve a value or for assigning value. The namespace is the unique identification of the variable or the method. Namespace tells the python interpreter about the name of the object and the location from where it is trying to access it.
Variables are not visible to the entire code; their visibility can be restricted. Scope verifies which variable can be ‘Seen’.

 
There are various types of Scopes in Python.
1. Local Scope
The Variables which are defined in the function are a local scope of the variable. These variables are defined in the function body. As per our definition, the variables which are declared inside the function body is a local variable.
2. Global Scope
The Variable which can be read from anywhere in the program is known as a global scope. These variables can be accessed inside and outside the function. When we want to use the same variable in the rest of the program, we declare it as global.
3. Non-Local or Enclosing Scope
Nonlocal Variable is the variable that is defined in the nested function. It means the variable can be neither in the local scope nor in the global scope. To create a nonlocal variable nonlocal keyword is used.
4. Built-in Scope
If a Variable is not defined in local, Enclosed or global scope, then python looks for it in the built-in scope. Python looks for the pi value in the built-in scope and prints the value. Hence the name which is already present in the built-in scope should not be used as an identifier.

How to Write Hello World Program in Python?
A simple way to write a hello world program in Python is:
print(“Hello World”)
This will print the text “Hello World” on the screen.

 
What are the Common Built-in Data Types in Python?
There are multiple built-in data types available in Python, including integers, floats, strings, lists and dictionaries. The following are the most commonly used data types in Python:
-Numbers
-Strings
-Tuples
-Lists
-Dicts
-Files
-Each of these data types can be instantiated with a list of values.

Does Python Support Multiple Lines of Code on One Line?
This is one of many questions that you should ask yourself if you are considering learning Python. The answer to this question would be yes because the language supports multiple lines of code on one line.

What are Functions in Python?
Functions are a piece of code that can be saved in a file so they will always be available. They usually have a name and a set of parameters that when called, will perform the actions defined when the function was written.
Python has a lot of functionalities and it also has a lot of different data types. Functions are just one of them! A function is a group of instructions that performs some operation on objects. These instructions can be combined to create more complex functions, which can then be combined into what are called functions libraries or modules.

 
Which benefits does your employer have in using Python?
Python is a language and software platform that is perfect for many organizations and large companies, because of its versatility. It allows programmers to write software in multiple programming paradigms, from object-oriented to procedural.
This language makes it possible for programmers to collaborate with one another without sacrificing modularity. In addition, Python’s open core approach means the base technology is freely available.
Python is used in a wide range of important and high paying jobs in highly competitive fields. Many companies use Python because it allows for increased efficiency and reduced errors in coding in the areas of data science, software development, machine learning, and artificial intelligence.

What are Modules, Packages, Globals, Imports, Exports?
Modules, Packages and Globals are Python’s three main objects that allow you to organize functions and data into separate files.
Importing and Exporting: These two commands allow you to import and export data from and to a module or package.
Imports: A module or package can import other modules or packages, but not variables outside of itself.
Exports: A module or package can export variables outside of itself, but it cannot import anything As you begin to use Python, it can be helpful to know what these terms mean and how they relate to the code that is compiled into your program.
In this blog, you will learn about Python’s use of modules and packages. You will also learn what we call imports and exports, and how they work in this programming language.

Differences Between Lists and Tuples?
Lists are groups of items, like arrays in other programming languages, whereas tuples are unordered collections of items that can be indexed. Lists are mutable, while tuples are immutable.
Tuples are immutable, that is, they cannot be changed once created. Lists are mutable, which allows them to be extended and reordered in order to change their content. Lists are sequences of values, while tuples are composed of heterogeneous values.
Lists can contain any type of value, while tuples cannot. When you concatenate two lists to make a list with repeated elements, the result is the same type as the input list.

 
Installation of Python?
There are many ways to install Python. However, the following is a quick and simple guide for installing Python on a Mac. This is what you’ll need to install Python: We will install Python on your laptop.
For this you need to know if you have the following things: free disk space on your laptop, administrator privileges, and a Linux-based operating system.

Difference between int() and float()
The int() function will return an integer, whereas the float() function will return a floating point number.

Frequently Asked Questions:
What is python used for?
How to learn python
How to install python
What are modules and packages in Python?
What are global, protected and private attributes in Python?

Hope the article is interesting, and useful for you to clear your mind.
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